@article{Bradford_2009,
    doi = {10.1051/ita/2009011},
    url = {https://doi.org/10.1051%2Fita%2F2009011},
    year = {2009},
    month = {apr},
    publisher = {{EDP} Sciences},
    volume = {43},
    number = {3},
    pages = {567--583},
    author = {Phillip G. Bradford and David A. Thomas},
    title = {Labeled shortest paths in digraphs with negative and positive edge weights},
    journal = {{RAIRO} - Theoretical Informatics and Applications}
}

@article{Bradford_2009, doi = {10.1051/ita/2009011}, url = {https://doi.org/10.1051%2Fita%2F2009011}, year = {2009}, month = {apr}, publisher = {{EDP} Sciences}, volume = {43}, number = {3}, pages = {567--583}, author = {Phillip G. Bradford and David A. Thomas}, title = {Labeled shortest paths in digraphs with negative and positive edge weights}, journal = {{RAIRO} - Theoretical Informatics and Applications} }